HVAC not working properly, zone system

Our hvac has never worked right. Not sure if the duck work is right. contractor went bankrupt at the end of our job. The inside unit has ran for 8 hours and has not pulled the temp up the 3 degrees we asked. temp outside was about 49 now is about 39. It is 5 tons outside. The outside unit has cycled on and off about every 5 minutes. The inside has stayed on. The second zone has not came on all day we did not need it to. No one can figure this out. The thermostat is Robert Shaw and I think the zone system is zonex and the outside unit is American Standard. The third top floor has a single unit, 3 tons. The loft open to the middle floor which is on the other 5 ton unit. I hope this makes since. Please help.